CVE-2026-44546 Affecting py3-daphne package, versions <4.2.3-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.17% (7th percentile)

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  • Snyk IDSNYK-ALPINE324-PY3DAPHNE-18603539
  • published10 Aug 2026
  • disclosed3 Jun 2026

Introduced: 3 Jun 2026

CVE-2026-44546  (opens in a new tab)

How to fix?

Upgrade Alpine:3.24 py3-daphne to version 4.2.3-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream py3-daphne package and not the py3-daphne package as distributed by Alpine. See How to fix? for Alpine:3.24 relevant fixed versions and status.

daphne before 4.2.2 reconstructs a raw HTTP request from Twisted's parsed headers and feeds it to autobahn for WebSocket handshake processing. Twisted does not treat \x0b, \x0c, \x1c, \x1d, \x1e, or \x85 as header line separators, but autobahn decodes header values to str and calls splitlines(). An attacker can exploit this parser differential to inject additional headers into the ASGI scope passed to the application. daphne now rejects requests with these bytes in any header value with a 400 response.

CVSS Base Scores

version 3.1